An affordable AV receiver is always a good option to consider, so Marantz SR6014 vs Onkyo TX-NR555 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Marantz SR6014 has 9.2 versus 7.2 for Onkyo TX-NR555. Regarding power, then SR6014 has such a W/Ohm ratio - 110/8, 185/6 when TX-NR555 has a power of 130/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, AK4458 384 KHz/32-bit for SR6014 and Hi-Grade 384 KHz/32-bit for the TX-NR555. Both the SR6014 and the TX-NR555 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. Rivals from our review have Bluetooth support. The Marantz SR6014 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The SR6014 can work with the audio stream from Deezer, TIDAL, Pandora, TuneIn Radio, iHeart Radio, and the TX-NR555 can receive a content from Deezer, TIDAL, Pandora. Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The SR6014 can scale the input HDMI signal, unlike the TX-NR555. Dolby Vision technology found support only on the SR6014.
The Marantz SR6014 has 8/3 HDMI inputs/outputs versus 6/1 HDMI connectors of the Onkyo TX-NR555. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the SR6014. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The SR6014 supports the protection of digital content of the standard HDCP 2.3, versus HDCP 2.2 in the TX-NR555. These compared receivers have a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Marantz SR6014.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.